Hi,
the blue point is not shown simply because it is printed outside
the current plot area. If you want to use the base graphics, you
have to manually define the xlim and ylim of the plot. Legend is added
with the command "legend".
E.g.
x=rbind(c(10,11),c(10,11))
y=cbind(-1:0,-1:0)
plot(y,col='yellow', xlim=c(-1,11), ylim=c(-1,11))
points(x,col='blue')
legend("topleft", c("x","y"), col=c('blue', 'yellow'), pch=1)
This is nevertheless most easily done in ggplot2.
E.g.
library(ggplot2)
# put the whole data in a data frame
# and add a new variable to distinguish both
dat <- data.frame(rbind(x,y), var=rep(c('x','y'), each=2))
qplot(x=X1,y=X2, colour=var, data=dat)
HTH,
Matthieu
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